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System Design · Concept

SLA

An SLA is not defined as a separate feature in this documentation. The page explains availability targets as uptime percentages, such as 99.9% and 99.99%, and shows their allowed downtime.

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In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • fail-over
  • active-passive
  • active-active
  • replication
  • load balancer
  • availability in numbers

Source: system-design-primer/README.md at ae9bbd7b02d90b9866215de185217d33f39ab733 · donnemartin/system-design-primer · GitHub. Checked 2026-11-03.